Hibernate3.2+JOTM2.0+Tomcat 5.5 整合

最近单位有一个网站的数据库负载过重,考虑进行数据库拆分,问题就来了,拆分以后数据库的事务处理咋办?因为以前写的java程序没有考虑到分布式事务。正好前两天接触了JOTM,这是个好东西。废话少说,马上开工。

网上查了好多关于3者的整合,但大都是Spring+Hibernate+JTOM的,很少有直接Hibernate+JOTM的(有,但很少),还是自己动手吧。

 

一.所需组件

二.JOTM2.0安装

1.       解压 jotm-2.0.10.tgz\jotm-2.0.10\lib 下所有 jar 包到 $TOMCAT5_HOME\common\lib

2.       重新编译 carol ,覆盖 $TOMCAT_HOME\common\lib 下的 ow_carol.jar 文件(和 jdk 有关系,所以要自己重新编译一下)

3.       $TOMCAT_HOME\common\classes\ 下建立 carol.properties 文件,内容如下(我测试的时候此文件不建立也可以)

# lmi stands for Local Method Invocation (it's a "fake" RMI)

carol.protocols=lmi

# do not use CAROL JNDI wrapper

carol.start.jndi=false

# do not start a name server

carol.start.ns=false

       4 JOTM 安装完成。

 

三.在Tomcat下建立两个数据源和一个事务处理

 

            <Resource 
                  name="zhang/jta1" 
                  auth="Container" 
                  description="DB Connection jat1"
                  factory="org.objectweb.jndi.DataSourceFactory"
                  type="javax.sql.DataSource"
                  driverClassName="com.mysql.jdbc.Driver"
                  url="jdbc:mysql://localhost:3306/jta1?autoReconnect=true"
                  username="root" 
                  password=""
                  />
                <Resource 
                  name="zhang/jta2" 
                  auth="Container" 
                  description="DB Connection jat2"
                  factory="org.objectweb.jndi.DataSourceFactory"
                  type="javax.sql.DataSource"
                  driverClassName="com.mysql.jdbc.Driver"
                  url="jdbc:mysql://localhost:3306/jta2?autoReconnect=true"
                  username="root" 
                  password=""
                  />
    <Resource name="UserTransaction" auth="Container"
    type="javax.transaction.UserTransaction"
    factory = "org.objectweb.jotm.UserTransactionFactory"
    jotm.timeout = "60"/>
 

网上的事务部分一般采用<Transaction>…..</Transaction>配置,但是我测了一下,就是不成,也不知是哪里出了问题,所以改用数据源的形式,效果一样.

注意:

上面配置数据源的时候参数名字一定要写对,开始的时候我的配置文件里面是 c3p0 的配置,当时没注意,就直接把 factory 后面类名改了一下,别的参数都没动,结果调了一天半也没弄好,后来, driverClass 改成 driverClassName jdbcUrl 改成 url user 改成 username 搞定,郁闷坏了 ……

 

四.配置web.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app version="2.4" 
        xmlns="http://java.sun.com/xml/ns/j2ee" 
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
        http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
        <resource-ref>
            <description>jta1</description>
            <res-ref-name>zhang/jta1</res-ref-name>
            <res-type>javax.sql.DataSource</res-type>
            <res-auth>Container</res-auth>
        </resource-ref>
        
        <resource-ref>
            <description>jt2</description>
            <res-ref-name>zhang/jta2</res-ref-name>
            <res-type>javax.sql.DataSource</res-type>
            <res-auth>Container</res-auth>
        </resource-ref>
        
        <resource-ref>
            <description>UserTransaction description</description>
            <res-ref-name>UserTransaction</res-ref-name>
            <res-type>javax.transaction.UserTransaction</res-type>
            <res-auth>Container</res-auth>
        </resource-ref>
        
        <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
      </welcome-file-list>
    </web-app>

 五.数据源配好了,下面改Hibernate了

因为是多数据库操作,需要建立两个HibernateSessionFactory和两个Hibernate配置文件。工厂部分代码直接拷贝一份,修改一下其中的CONFIG_FILE_LOCATION就可以了

 

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
    <!DOCTYPE hibernate-configuration PUBLIC
     "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
     "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

    <!-- Generated by MyEclipse Hibernate Tools.                   -->
    <hibernate-configuration>
       
        <session-factory>
            <property name="transaction.factory_class">
                org.hibernate.transaction.JTATransactionFactory
            </property>
            <property name="connection.datasource">java:comp/env/zhang/jta1</property>
            <property name="jta.UserTransaction">java:comp/env/UserTransaction</property>
            <property name="transaction.manager_lookup_class">org.hibernate.transaction.JOTMTransactionManagerLookup</property>
            <property name="show_sql">
                true
            </property>
           
            <property name="dialect">
                org.hibernate.dialect.MySQLDialect
            </property>
            <mapping resource="com/zhang/pojos/Users.hbm.xml"/>
           
        </session-factory>
    </hibernate-configuration>
 


hibernate2.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
    <!DOCTYPE hibernate-configuration PUBLIC
     "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
     "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

    <!-- Generated by MyEclipse Hibernate Tools.                   -->
    <hibernate-configuration>
       
        <session-factory>
            <property name="transaction.factory_class">
                org.hibernate.transaction.JTATransactionFactory
            </property>
            <property name="connection.datasource">java:comp/env/zhang/jta2</property>
            <property name="jta.UserTransaction">java:comp/env/UserTransaction</property>
            <property name="show_sql">
                true
            </property>
           
            <property name="dialect">
                org.hibernate.dialect.MySQLDialect
            </property>
            <mapping resource="com/zhang/pojos/Address.hbm.xml"/>
           
        </session-factory>
    </hibernate-configuration>

 

六.测试代码

package com.zhang.test;
    import javax.naming.InitialContext;
    import javax.naming.NamingException;
    import javax.transaction.SystemException;
    import javax.transaction.UserTransaction;
    import org.hibernate.Session;
    import com.zhang.factory.HibernateSessionFactory;
    import com.zhang.factory.HibernateSessionFactory2;
    import com.zhang.pojos.Address;
    import com.zhang.pojos.Users;
    public class Test {
        public void insertinto() {
            UserTransaction tx = null;
            try {
                tx = (UserTransaction) new InitialContext().lookup("java:comp/env/UserTransaction");
                
            } catch (NamingException e1) {
                e1.printStackTrace();
            }
            try {
                tx.begin();
                Session session = HibernateSessionFactory.getSession();
    //          
                Users user = new Users();
                user.setUsername("SSSSS");
                user.setPassword("123");
                session.save(user);
                
                Session session2 = HibernateSessionFactory2.getSession();
                Address address = new Address();
                address.setUsersId(1);
                address.setAddress("XXXXXXX");
                session2.save(address);
                tx.commit();
            } catch (Exception e) {
                e.printStackTrace();
                try {
                    tx.rollback();
                } catch (IllegalStateException e1) {
                    e1.printStackTrace();
                } catch (SecurityException e1) {
                    e1.printStackTrace();
                } catch (SystemException e1) {
                    e1.printStackTrace();
                }
            }
        }
    }

以上配置本家调试通过,如果有什么问题希望大家留言~共同进步~~

 

CSDN本人原创.今搬家至ITEYE.版权所有@Robot_G

 

你可能感兴趣的:(sql,tomcat,mysql,xml,Hibernate)